drivers/pnp/isapnp/proc.c

   1 /*
   2  *  ISA Plug & Play support
   3  *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  *
  20  */
  21
  22 #include <linux/config.h>
  23 #include <linux/module.h>
  24 #include <linux/isapnp.h>
  25 #include <linux/proc_fs.h>
  26 #include <linux/init.h>
  27 #include <linux/smp_lock.h>
  28 #include <asm/uaccess.h>
  29
  30 extern struct pnp_protocol isapnp_protocol;
  31
  32 static struct proc_dir_entry *isapnp_proc_bus_dir = NULL;
  33
  34 static loff_t isapnp_proc_bus_lseek(struct file *file, loff_t off, int whence)
  35 {
  36         loff_t new = -1;
  37
  38         lock_kernel();
  39         switch (whence) {
  40         case 0:
  41                 new = off;
  42                 break;
  43         case 1:
  44                 new = file->f_pos + off;
  45                 break;
  46         case 2:
  47                 new = 256 + off;
  48                 break;
  49         }
  50         if (new < 0 || new > 256) {
  51                 unlock_kernel();
  52                 return -EINVAL;
  53         }
  54         unlock_kernel();
  55         return (file->f_pos = new);
  56 }
  57
  58 static ssize_t isapnp_proc_bus_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
  59 {
  60         struct inode *ino = file->f_dentry->d_inode;
  61         struct proc_dir_entry *dp = PDE(ino);
  62         struct pnp_dev *dev = dp->data;
  63         int pos = *ppos;
  64         int cnt, size = 256;
  65
  66         if (pos >= size)
  67                 return 0;
  68         if (nbytes >= size)
  69                 nbytes = size;
  70         if (pos + nbytes > size)
  71                 nbytes = size - pos;
  72         cnt = nbytes;
  73
  74         if (!access_ok(VERIFY_WRITE, buf, cnt))
  75                 return -EINVAL;
  76
  77         isapnp_cfg_begin(dev->card->number, dev->number);
  78         for ( ; pos < 256 && cnt > 0; pos++, buf++, cnt--) {
  79                 unsigned char val;
  80                 val = isapnp_read_byte(pos);
  81                 __put_user(val, buf);
  82         }
  83         isapnp_cfg_end();
  84
  85         *ppos = pos;
  86         return nbytes;
  87 }
  88
  89 static struct file_operations isapnp_proc_bus_file_operations =
  90 {
  91         .llseek         = isapnp_proc_bus_lseek,
  92         .read           = isapnp_proc_bus_read,
  93 };
  94
  95 static int isapnp_proc_attach_device(struct pnp_dev *dev)
  96 {
  97         struct pnp_card *bus = dev->card;
  98         struct proc_dir_entry *de, *e;
  99         char name[16];
 100
 101         if (!(de = bus->procdir)) {
 102                 sprintf(name, "%02x", bus->number);
 103                 de = bus->procdir = proc_mkdir(name, isapnp_proc_bus_dir);
 104                 if (!de)
 105                         return -ENOMEM;
 106         }
 107         sprintf(name, "%02x", dev->number);
 108         e = dev->procent = create_proc_entry(name, S_IFREG | S_IRUGO, de);
 109         if (!e)
 110                 return -ENOMEM;
 111         e->proc_fops = &isapnp_proc_bus_file_operations;
 112         e->owner = THIS_MODULE;
 113         e->data = dev;
 114         e->size = 256;
 115         return 0;
 116 }
 117
 118 #ifdef MODULE
 119 static int __exit isapnp_proc_detach_device(struct pnp_dev *dev)
 120 {
 121         struct pnp_card *bus = dev->card;
 122         struct proc_dir_entry *de;
 123         char name[16];
 124
 125         if (!(de = bus->procdir))
 126                 return -EINVAL;
 127         sprintf(name, "%02x", dev->number);
 128         remove_proc_entry(name, de);
 129         return 0;
 130 }
 131
 132 static int __exit isapnp_proc_detach_bus(struct pnp_card *bus)
 133 {
 134         struct proc_dir_entry *de;
 135         char name[16];
 136
 137         if (!(de = bus->procdir))
 138                 return -EINVAL;
 139         sprintf(name, "%02x", bus->number);
 140         remove_proc_entry(name, isapnp_proc_bus_dir);
 141         return 0;
 142 }
 143 #endif /* MODULE */
 144
 145 int __init isapnp_proc_init(void)
 146 {
 147         struct pnp_dev *dev;
 148         isapnp_proc_bus_dir = proc_mkdir("isapnp", proc_bus);
 149         protocol_for_each_dev(&isapnp_protocol,dev) {
 150                 isapnp_proc_attach_device(dev);
 151         }
 152         return 0;
 153 }
 154
 155 #ifdef MODULE
 156 int __exit isapnp_proc_done(void)
 157 {
 158         struct pnp_dev *dev;
 159         struct pnp_bus *card;
 160
 161         isapnp_for_each_dev(dev) {
 162                 isapnp_proc_detach_device(dev);
 163         }
 164         isapnp_for_each_card(card) {
 165                 isapnp_proc_detach_bus(card);
 166         }
 167         if (isapnp_proc_bus_dir)
 168                 remove_proc_entry("isapnp", proc_bus);
 169         return 0;
 170 }
 171 #endif /* MODULE */